Merlin D'Souza is an Indian composer and pianist from Bombay. She is a musician whose work includes composing for film, albums, theatre, and advertising. Merlin grew up in Bandra, started learning the piano at age 6, became an All India Radio performing artiste at 9, started playing in the church at 12, and bunked college at 18 to score and perform for Noel Godin's musical production (Blood Brothers). She is trained in western classical (Trinity College Performer's Licentiate) and liberated by jazz.

Merlin's journey in theatre as a music director has seen her score for Alyque Padamsee's Romeo and Juliet, Pearl Padamsee's Godspell, Naseeruddin Shah's Julius Caesar, and Etienne Coutinho's Jazz., Raell Padamsee's: Sound of Music 2012, GREASE-2013. 

Merlin's foray into films as composer, arranger, and vocal director has hit the right notes in Kabhi Khushi Kabhie Gham, Road, Bus Yun Hi, Rules: Pyaar Ka Superhit Formula, Prince of Egypt, and more.

She has performed with Shubha Mudgal, Trilok Gurtu, Talvin Singh, Taufiq Qureshi, and Rakesh Chaurasia.

Merlin sang the Indian national anthem in the Indian Super League. She has also worked with Ranbir Kapoor by directing him to sing the Indian national anthem in the Indian Super League.

In October 2016, Merlin was one of the musical ambassadors for the BMW national tour in India.

In November 2016, Merlin performed a musical medley along with the acclaimed INDIVA in Bandra.